c++问题，我在网上下了一个c++写的视频传输的程序，c/s模式，但是不知道程序具体的意思，各位帮帮我解释一

其中包括好几个部分，源文件有ListenSock.cpp，ServerCtrlSock.cpp，ServerPlus.cpp，ServerPlusDlg.cpp，Serv... 其中包括好几个部分，源文件有ListenSock.cpp，ServerCtrlSock.cpp，ServerPlus.cpp，ServerPlusDlg.cpp，ServerStreamSock.cpp，StdAfx.cpp。
其中的程序：ListenSock.cpp：
// ListenSock.cpp : implementation file
//

#include "stdafx.h"
#include "ServerPlus.h"
#include "ListenSock.h"

#include "ServerPlusDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CListenSock

CListenSock::CListenSock()
{
}

CListenSock::~CListenSock()
{
}

// Do not edit the following lines, which are needed by ClassWizard.
#if 0
BEGIN_MESSAGE_MAP(CListenSock, CAsyncSocket)
//{{AFX_MSG_MAP(CListenSock)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
#endif // 0

/////////////////////////////////////////////////////////////////////////////
// CListenSock member functions

void CListenSock::OnAccept(int nErrorCode)
{
CServerPlusDlg* pDlg=(CServerPlusDlg*)::AfxGetMainWnd();

if (pDlg->m_ServerStreamSock.m_hSocket==INVALID_SOCKET && nErrorCode==0)
{
Accept(pDlg->m_ServerStreamSock);
pDlg->m_ServerStreamSock.AsyncSelect(FD_READ | FD_WRITE);
}
else if(pDlg->m_ServerCtrlSock==INVALID_SOCKET && nErrorCode==0)
{
Accept(pDlg->m_ServerCtrlSock);
pDlg->m_ServerCtrlSock.AsyncSelect(FD_READ | FD_WRITE|FD_CONNECT);
AfxMessageBox("User Connected,Begin transporting video image!");

//send the compressor's output format to the client as the decompressor's input format
SERVER_CTRL_MSG msg;
memset(&msg,0,sizeof(SERVER_CTRL_MSG));
strcpy(msg.strCommand,"Set Bitmap Info");
memcpy(msg.strContent,pDlg->m_pOutInfo,sizeof(BITMAPINFO));
msg.nContentUsedByte=sizeof(BITMAPINFO);
pDlg->m_ServerCtrlSock.Send(&msg,sizeof(SERVER_CTRL_MSG));

//send the compressor's COMPVARS struct to the client
memset(&msg,0,sizeof(SERVER_CTRL_MSG));
strcpy(msg.strCommand,"Set COMPVARS");
msg.nContentUsedByte=sizeof(COMPVARS);
memcpy(msg.strContent,&pDlg->m_CV,sizeof(COMPVARS));
pDlg->m_ServerCtrlSock.Send(&msg,sizeof(SERVER_CTRL_MSG));

afxDump<<pDlg->m_CV.fccType<<"\n";

pDlg->m_bConnect=TRUE;

}

// TODO: Add your specialized code here and/or call the base class

CAsyncSocket::OnAccept(nErrorCode);
}
就是不明白，请各位解释一下，好的我一定加分，谢谢...... 展开

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